Molecularly imprinted polypyrrole encapsulated carbon nanotubes in stainless steel frit for micro solid phase extraction of estrogenic compounds

J Nanosci Nanotechnol. 2007 Sep;7(9):3095-103. doi: 10.1166/jnn.2007.666.

Abstract

A novel micro-solid phase extraction (microSPE) device was prepared by electrochemically adhering molecularly imprinted polypyrrole encapsulated carbon nanotubes (MIPPy/CNTs) onto a stainless steel frit. It was found that the use of CNTs increased the total binding capacity without compromising the porosity of the frit. Three templates, 17alpha-ethynyl estradiol (EE2), 17beta-estradiol (E2), and ochratoxin A (OTA) were imprinted individually to make their respective MIPPy/CNTs-modified frits. The binding properties of these microSPE devices were characterized by high performance liquid chromatography (HPLC) with fluorescence detection (FLD). In comparison with non-imprinted polypyrrole encapsulated carbon nanotubes (PPy/CNTs), the molecular imprinting technique enhanced the selective binding towards the imprint molecules. MIPPy/CNTs-microSPE-HPLC-FLD results demonstrated the selectivity of MIPPy had been tailored by imprinting with different templates. This is the first report on how versatile pyrrole can be as a functional monomer for the molecular imprinting of target compounds with a broad range of high to low pKa values.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Chromatography, High Pressure Liquid
  • Electrochemistry / methods
  • Estrogens / chemistry
  • Estrogens / isolation & purification*
  • Hydrogen-Ion Concentration
  • Microscopy, Electron, Scanning
  • Models, Chemical
  • Molecular Imprinting
  • Nanotechnology / methods*
  • Nanotubes, Carbon / chemistry*
  • Ochratoxins / chemistry
  • Polymers / chemistry*
  • Pyrroles / chemistry*
  • Sensitivity and Specificity
  • Solid Phase Extraction
  • Spectrometry, Fluorescence
  • Stainless Steel / chemistry*

Substances

  • Estrogens
  • Nanotubes, Carbon
  • Ochratoxins
  • Polymers
  • Pyrroles
  • Stainless Steel
  • ochratoxin A
  • polypyrrole